US11345559B2 - Sheet conveyance device and image forming apparatus - Google Patents
Sheet conveyance device and image forming apparatus Download PDFInfo
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- US11345559B2 US11345559B2 US16/592,660 US201916592660A US11345559B2 US 11345559 B2 US11345559 B2 US 11345559B2 US 201916592660 A US201916592660 A US 201916592660A US 11345559 B2 US11345559 B2 US 11345559B2
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- sheet
- conveyance roller
- conveyance
- roller
- speed
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/002—Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
- B65H29/125—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers between two sets of rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
- B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
- B65H7/14—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors by photoelectric feelers or detectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/142—Roller pairs arranged on movable frame
- B65H2404/1421—Roller pairs arranged on movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/142—Roller pairs arranged on movable frame
- B65H2404/1422—Roller pairs arranged on movable frame reciprocating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/143—Roller pairs driving roller and idler roller arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
- B65H2404/1441—Roller pairs with relative movement of the rollers to / from each other involving controlled actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
- B65H2404/1442—Tripping arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/15—Roller assembly, particular roller arrangement
- B65H2404/152—Arrangement of roller on a movable frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/18—Rollers composed of several layers
- B65H2404/185—Rollers composed of several layers easy deformable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/22—Distance
- B65H2511/224—Nip between rollers, between belts or between rollers and belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/10—Speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/13—Parts concerned of the handled material
- B65H2701/131—Edges
- B65H2701/1315—Edges side edges, i.e. regarded in context of transport
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
Definitions
- the present invention relates to a sheet conveyance device and an image forming apparatus.
- a paper jam or paper damage may be caused when the position of a sheet moves away from the designated position due to a sheet deviation.
- the angle of the conveyance roller is modified, or the speed of the conveyance roller is varied in the direction of sheet width so that such sheet deviations are controlled.
- the present invention is conceived in view of problems in the prior art described above, and an object thereof is controlling the position of a sheet by a simple mechanism.
- a sheet conveyance device reflecting one aspect of the present invention includes:
- a first conveyance roller and a second conveyance roller that are arranged at a position other than a center in a direction of sheet width in a sheet conveyance path;
- roller selector that selects the first conveyance roller or the second conveyance roller as a roller to convey a sheet
- the first conveyance roller is made of a material that causes a speed of the sheet conveyed by the first conveyance roller in contact with the first conveyance roller to be higher than a rotation speed of the first conveyance roller
- the second conveyance roller is made of a material that causes a speed of the sheet conveyed by the second conveyance roller in contact with the second conveyance roller to be lower than a rotation speed of the second conveyance roller.
- an image forming unit that forms an image on the sheet.
- FIG. 1 is a schematic cross-sectional view of a conveyance roller.
- FIG. 2 is a graph showing changes in the surface speed of a conveyance roller of incompressible rubber material and a conveyance roller of compressible rubber material, when the contact pressing force is being varied.
- FIG. 3 is a block diagram showing a functional configuration of an image forming apparatus in the first embodiment.
- FIG. 4A is a schematic top view of the conveyance rollers used for sheet deviation control.
- FIG. 4B is a schematic cross-sectional view of the conveyance rollers.
- FIG. 5A shows a state where a rotation driving force is applied to the conveyance roller of incompressible rubber material.
- FIG. 5B shows a state where a rotation driving force is applied to the conveyance roller of compressible rubber material.
- FIG. 6 shows a configuration of an eccentric cam.
- FIG. 7A shows a positional relation of a sheet detection sensor and a sheet when an output of the sheet detection sensor is ON.
- FIG. 7B shows a positional relation of the sheet detection sensor and the sheet when an output of the sheet detection sensor is OFF.
- FIG. 8A shows a positional relation of the sheet detection sensor and the sheet drawn to the far side.
- FIG. 8B shows a positional relation of the sheet detection sensor and the sheet at or near the center.
- FIG. 8C shows a positional relation of the sheet detection sensor and the sheet drawn to the near side.
- FIG. 9 shows relations between the sheet position and the output of the sheet detection sensors.
- FIG. 10 is a flow chart of the first sheet deviation control processing executed by the image forming apparatus in the first embodiment.
- FIG. 11 is an explanatory drawing of another mechanism to select a conveyance roller from conveyance rollers with different speed characteristics.
- FIG. 12 is a flow chart of the second sheet deviation control processing executed by the image forming apparatus in the second embodiment.
- FIG. 13 is a schematic top view of conveyance rollers used for the sheet deviation control of the image forming apparatus in the third embodiment.
- FIG. 14 is a flow chart of the third sheet deviation control processing executed by the image forming apparatus in the third embodiment.
- FIG. 15 is a schematic top view of conveyance roller sets used for the sheet deviation control of the image forming apparatus in the fourth embodiment.
- FIG. 16 is a flow chart of the fourth sheet deviation control processing executed by the image forming apparatus in the fourth embodiment.
- FIG. 17 is a timing chart showing sheet positions, output of the sheet detection sensors, and contact and release of the sets of conveyance rollers.
- FIG. 18A is an explanatory drawing showing movement of sheet in a case where the conveyance roller of incompressible rubber material on the far side is selected for a cut sheet.
- FIG. 18B is an explanatory drawing showing movement of sheet in a case where the conveyance roller of compressible rubber material on the far side is selected for a cut sheet.
- FIGS. 19A and 19B are explanatory drawings showing the amount of shrinking of the conveyance roller.
- FIG. 1 is a schematic cross-sectional view of a conveyance roller 21 .
- the conveyance roller 21 when used, is pressed against a facing roller 22 facing the conveyance roller 21 and drives to rotate on the roller axis.
- the sheet P is held with the conveyance roller 21 and the facing roller 22 therebetween, and is conveyed while being pressed against the facing roller 22 by the conveyance roller 21 .
- the conveyance speed of the sheet P may vary according to the difference in material of the conveyance rollers 21 even in a case where the conveyance rollers 21 rotate at the same speed.
- the speed of the sheet P which is conveyed by the conveyance roller 21 in pressure contact therewith is higher than the rotation speed of the conveyance roller 21 .
- the speed of the sheet P which is conveyed by the conveyance roller 21 in pressure contact therewith is lower than the rotation speed of the conveyance roller 21 .
- conveyance roller 21 is defined as being “made of incompressible material,” it means that at least the outermost layer of the conveyance roller 21 is made of incompressible material, and when the conveyance roller 21 is defined as being “made of compressible material,” it means that at least the outermost layer of the conveyance roller 21 is made of compressible material.
- the rotation speed of the conveyance roller 21 when rotary driving, is referred to as Vs, and the surface speed (the sheet conveyance speed at the nip part) of the conveyance roller 21 which is pressed to the facing roller 22 is referred to as Vt.
- the conveyance speed of the sheet P is controlled to vary in the direction of sheet width by using the gap in the sheet conveyance speed at the nip part caused by the difference in material of the conveyance roller 21 .
- the direction of sheet width is the direction perpendicular to the direction of conveyance of a sheet and horizontal to the surface of the sheet.
- An incompressible material is a material with a volume that is barely changeable by compression, and is a rubber material, for example.
- a compressible material is a material with a volume that is changeable by compression, and is a urethane material, for example.
- the characteristics of incompressible materials and compressible materials are discriminated with the Poisson's ratio, whose values range between 0.0 and 0.5.
- the Poisson's ratio of incompressible materials is around 0.5 while the Poisson's ratio of compressible materials is around 0.0.
- incompressible rubber material with a Poisson ratio of 0.49 is used as an example of incompressible materials
- a compressible rubber material with a Poisson ratio of 0.01 is used as an example of compressible materials.
- FIG. 2 is a graph showing changes in the surface speed of the conveyance rollers 21 , one of which is a conveyance roller 21 made of incompressible rubber material (with a Poisson ratio of 0.49) and the other one of which is a conveyance roller 21 made of compressible rubber material (with a Poisson ratio of 0.01), when the contact pressing force is varied.
- a silicone rubber is used as the incompressible rubber material, and a urethane foam rubber as the compressible rubber material.
- the surface speed of the conveyance roller 21 may be higher or lower depending on the material of the conveyance roller 21 , despite the contact pressing force being equal. It is also shown that the surface speed of the conveyance roller 21 is varied according to the contact pressing force of the conveyance roller 21 . That is, an extent to which the surface speed of the conveyance roller 21 gets higher or lower can be changed by changing the contact pressing force of the conveyance roller 21 .
- FIG. 3 is a block diagram showing a functional configuration of the image forming apparatus 100 in the first embodiment.
- the image forming apparatus 100 includes a controller 11 , an operation interface 12 , a display 13 , a communicator 14 , a storage 15 , a sheet feeder 16 , an image forming unit 17 , a conveyor 18 , a sheet detection sensor 19 , etc.
- the controller 11 is configured as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. and integrally controls the operations of each component of the image forming apparatus 100 .
- the CPU reads out various kinds of processing programs stored in the ROM, loads them in the RAM, and executes various kinds of processing according to the loaded programs.
- the operation interface 12 includes a touch panel which is formed to cover the display screen of the display 13 , and various operation buttons such as number buttons and a start button.
- the operation interface 12 outputs operation signals to the controller 11 according to user operations.
- the display 13 which is configured as an LCD (Liquid Crystal Display), displays various screens according to commands of display signals input via the controller 11 .
- LCD Liquid Crystal Display
- the communicator 14 sends and receives data to and from an external device(s) connected to a communication network.
- the communicator 14 receives image data on an image to be formed from the external device(s).
- the storage 15 which is configured as a memory device such as a non-volatile semiconductor memory and a hard disk, stores data concerning various kinds of processing therein.
- the sheet feeder 16 provides sheet P to the image forming unit 17 .
- a continuous sheet is used as the sheet P.
- the sheet feeder 16 may rotatably hold a roll of continuous sheet which is wound around a supporting shaft, or hold a fanfold continuous sheet.
- the image forming unit 17 forms an image(s) on the sheet P on the basis of the image data.
- the image forming unit 17 is not particularly limited, and may be of, for example, the electrophotographic type or the inkjet type.
- the conveyor 18 is a mechanism to convey the sheet P in the image forming apparatus 100 , which includes multiple conveyance rollers.
- the conveyor 18 conveys the sheet P from the sheet feeder 16 to the image forming unit 17 with the multiple conveyance rollers, conveys the sheet P during and after the image forming, and conveys the sheet P out of the image forming apparatus 100 .
- the conveyance rollers used for the sheet deviation control among the multiple conveyance rollers are referred to as the “conveyance rollers 21 .”
- the reference signs of the conveyance rollers 21 such as “ 21 A and 21 B” may be used to distinguish one from another.
- the conveyance rollers 21 are arranged between the sheet feeder 16 and the image forming unit 17 , for example.
- FIG. 4A is a schematic top view of the conveyance roller 21 A and the conveyance roller 21 B used for the sheet deviation control.
- FIG. 4B is a schematic cross-sectional view of the conveyance roller 21 A and the conveyance roller 21 B.
- the conveyance roller 21 A and the conveyance roller 21 B are arranged in the sheet conveyance path at a position farther than the center in the direction of sheet width.
- the conveyance roller 21 A and the conveyance roller 21 B are preferably arranged near the end of a sheet in the direction of sheet width.
- the conveyance roller 21 A and the conveyance roller 21 B are drive rollers that are rotated by a driver.
- the conveyance roller 21 A is the first conveyance roller which is made of a material (an incompressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 A in contact therewith at a speed higher than the rotation speed of the conveyance roller 21 A.
- the conveyance roller 21 B is the second conveyance roller which is made of a material (a compressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 B in contact therewith at a speed lower than the rotation speed of the conveyance roller 21 B.
- the facing roller 22 A faces the conveyance roller 21 A across the sheet conveyance path
- the facing roller 22 B faces the conveyance roller 21 B across the sheet conveyance path.
- the conveyance roller 21 A is, when used, pressed against the facing roller 22 A.
- the conveyance roller 21 B is, when used, pressed against the facing roller 22 B. In FIG. 4B , the conveyance roller 21 B is pressed against the facing roller 22 B.
- FIG. 5A shows a state where the rotation driving force which causes the conveyance roller 21 A to rotate at the rotation speed Vp is applied to the conveyance roller 21 A made of incompressible rubber material while the sheet P (continuous sheet) is being conveyed at the speed Vp.
- FIG. 5B shows a state where the rotation driving force which causes the conveyance roller 21 B to rotate at the rotation speed Vp is applied to the conveyance roller 21 B made of compressible rubber material while the sheet P (continuous sheet) is being conveyed at the speed Vp.
- the conveyor 18 includes a roller driver 181 , a roller selector 182 , a contact pressure changer 183 .
- the roller driver 181 rotary drives each of the conveyance rollers of the conveyor 18 .
- the roller selector 182 selects the conveyance roller 21 A or the conveyance roller 21 B as a roller to convey the sheet P for the sheet deviation control.
- the roller selector 182 is capable of individually pressing or separating the conveyance rollers 21 A and 21 B.
- the contact pressure changer 183 changes the contact pressing force for pressing the conveyance roller 21 A and the conveyance roller 21 B respectively against the facing rollers 22 A and 22 B.
- the contact pressure changer 183 changes the contact pressing force of the conveyance rollers 21 A or 21 B selected by the roller selector 182 against the facing rollers 22 A or 22 B.
- An eccentric cam 31 shown in FIG. 6 is used as the roller selector 182 and the contact pressure changer 183 , for example.
- the eccentric cam 31 is rotated on the axis 32 , and the lowest position of the eccentric cam 31 is changed in the range of L1.
- the roller selector 182 and the contact pressure changer 183 are realized by the eccentric cam 31 which presses the roller shafts of the conveyance rollers 21 A and 21 B at the lowest part of the eccentric cam 31 .
- roller selector 182 and the contact pressure changer 183 may be realized by a solenoid which presses the roller shafts of the conveyance rollers 21 A and 21 B.
- the roller selector 182 and the contact pressure changer 183 may be realized by individual mechanisms.
- the sheet detection sensor 19 is arranged in the sheet conveyance path to detect presence or absence of the sheet P and output the detection results to the controller 11 . With the knowledge of the width of the conveying sheet P, it is possible to determine the position of the entire sheet P by detecting the position of an edge in the width direction of the sheet P.
- the sheet detection sensor 19 functions as a sheet position detector which detects the position of the sheet P in the direction of sheet width.
- the sheet detection sensor 19 includes a light emitter and a light receiver on the side facing the sheet P. As shown in FIG. 7A , in a case where light emitted by the light emitter is reflected on the sheet P and reflected light is received by the light receiver, the sheet detection sensor 19 outputs ON (sheet present). As shown in FIG. 7B , in a case where light emitted by the light emitter is not reflected on the sheet P and no reflected light is received by the light receiver, the sheet detection sensor 19 outputs OFF (no sheet).
- the position of the sheet P in the direction of sheet width is regarded as “drawn to the far side,” “at or near the center,” and “drawn to the near side,” using two sheet detection sensors 19 A and 19 B.
- the sheet detection sensors 19 A and 19 B are arranged at or near the end on the far side in the direction of sheet width, spaced at a predetermined interval in the direction of sheet width.
- FIG. 8A shows a positional relation of the sheet P drawn to the far side and the sheet detection sensors 19 A and 19 B. In this state, the edge on the far side of the sheet P is on the side farther than the sheet detection sensor 19 A.
- FIG. 8B shows a positional relation of the sheet P at or near the center and the sheet detection sensors 19 A and 19 B. In this state, the edge on the far side of the sheet P is located between the sheet detection sensor 19 A and the sheet detection sensor 19 B.
- FIG. 8C shows a positional relation of the sheet P drawn to the near side and the sheet detection sensors 19 A and 19 B. In this state, the edge on the far side of the sheet P is on the side nearer than the sheet detection sensor 19 B.
- FIG. 9 shows relations between the sheet position and the output (ON/OFF) of the sheet detection sensors 19 A and 19 B.
- both the sheet detection sensors 19 A and 19 B are “ON.”
- the sheet detection sensor 19 A is “OFF”
- the sheet detection sensor 19 B is “ON.”
- both the sheet detection sensors 19 A and 19 B are “OFF.”
- the controller 11 causes the roller selector 182 to select the conveyance roller 21 A or the conveyance roller 21 B on the basis of the position of the sheet P detected by the sheet detection sensors 19 A and 19 B.
- FIG. 10 is a flow chart of the first sheet deviation control processing executed by the image forming apparatus 100 .
- the controller 11 determines whether or not the sheet is drawn to the far side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 1 ). Specifically, if both the sheet detection sensors 19 A and 19 B are “ON,” the controller 11 determines that the sheet is drawn to the far side.
- Step S 2 the controller 11 controls the roller selector 182 to select the conveyance roller 21 B of compressible rubber material.
- the conveyance roller 21 B is pressed against the facing roller 22 B and the sheet P is conveyed by rotation of the conveyance roller 21 B, the sheet P is moved toward the near side in the direction of sheet width (see FIG. 5B ).
- Step S 2 After performing Step S 2 , or if the sheet is not drawn to the far side or at Step S 1 (Step S 1 ; NO), the controller 11 determines whether or not the sheet is at or near the center on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 3 ). Specifically, if the sheet detection sensor 19 A is “OFF” and the sheet detection sensor 19 B is “ON,” the controller 11 determines that the sheet is at or near the center.
- Step S 3 If the sheet is at or near the center (Step S 3 ; YES), the controller 11 controls the roller selector 182 to release pressure contact of the conveyance rollers 21 A and 21 B (Step S 4 ). Instead of separating the conveyance rollers 21 A and 21 B away, the controller 11 may cause them to be in a slightly pressed state which does not generate a gap in speed in the direction of sheet width.
- Step S 3 After performing Step 4 , or if the sheet is not at or near the center at Step S 3 (Step S 3 ; NO), the controller 11 determines whether or not the sheet is drawn to the near side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 5 ). Specifically, if both the sheet detection sensors 19 A and 19 B are “OFF,” the controller 11 determines that the sheet is drawn to the near side.
- Step S 5 If the sheet is drawn to the near side (Step S 5 ; YES), the controller 11 controls the roller selector 182 to select the conveyance roller 21 A of incompressible rubber material (Step S 6 ). As the conveyance roller 21 A is pressed against the facing roller 22 B and the sheet P is conveyed by rotation of the conveyance roller 21 A, the sheet P moves toward the far side in the direction of sheet width (see FIG. 5A ).
- Step S 6 After performing Step S 6 , or if the sheet is not drawn to the near side at Step S 5 (Step S 5 ; NO), the process is returned to Step S 1 and repeated.
- the conveyance roller 21 A of incompressible rubber material and the conveyance roller 21 B of compressible rubber material are arranged at positions other than the central part in the direction of sheet width (at an end on the far side in the first embodiment) and either one of the conveyance rollers 21 A and 21 B is caused to convey the sheet P while pressing it.
- This can generate a gap in speed of the sheet P in the direction of sheet width and a resultant force to shift the sheet P in the direction of sheet width.
- the conveyance rollers 21 A and 21 B of different materials may be controlled by a simple mechanism, as described above.
- the rotation speed of the conveyance rollers 21 A and 21 B may be the same, and there is no need to include multiple driving motors to rotary drive the conveyance rollers 21 A and 21 B.
- the position of the sheet P in the direction of sheet width may be controlled according to the deviation of the sheet P (to which side the sheet P is deviated in the direction of sheet width).
- the conveyance rollers 21 can be configured to have a surface speed at the nip part that is higher or lower than the original sheet conveyance speed, and a gap between the original sheet conveyance speed and the surface speed of the conveyance roller 21 at the nip part can be kept small. Thus, load is not applied to any other sheet conveyance mechanism, and the sheet itself is not subject to excessive stress.
- the mechanism which enables the roller selector 182 to select the conveyance roller 21 A or 21 B is not limited to the examples described above.
- a common facing roller 22 may be provided for the conveyance roller 21 A and 21 B, and the roller selector 182 may select the conveyance roller 21 A or 21 B by changing the positions of the conveyance rollers 21 A and 21 B with each other.
- the image forming apparatus in the second embodiment is configured similarly to the image forming apparatus 100 in the first embodiment except for the sheet detection sensors 19 .
- the common components are labelled with the same reference signs, and descriptions thereof are omitted.
- the configuration and processing specific to the second embodiment are described.
- the sheet detection sensors 19 detect presence and absence of the sheet P at more points in the direction of sheet width to detect the position of the sheet P in the direction of sheet width as one of some stepwise positions.
- the sheet detection sensors 19 function as a deviation detector to detect the deviation amount of the sheet P in the direction of sheet width.
- the deviation amount is the amount of deviation from the correct position of the sheet P in the direction of sheet width.
- the output of the sheet detection sensors 19 tells how much the sheet P is deviated to the far side or to the near side.
- the controller 11 causes the contact pressure changer 183 to change the contact pressing force of the conveyance roller 21 A or the conveyance roller 21 B according to the detected deviation amount.
- FIG. 12 is a flow chart of the sheet deviation control processing executed by the image forming apparatus in the second embodiment.
- the controller 11 determines whether or not the sheet is drawn to the far side on the basis of the output of the sheet detection sensors 19 (Step S 11 ).
- Step S 11 determines the deviation amount (extent of deviation to the far side) on the basis of the output of the sheet detection sensors 19 .
- the controller 11 determines the contact pressing force on the basis of the deviation amount (Step S 12 ). Specifically, the controller 11 selects a larger contact pressing force for a larger deviation amount.
- the controller 11 controls the roller selector 182 to select the conveyance roller 21 B of incompressible rubber material (Step S 13 ).
- the controller 11 controls the contact pressure changer 183 to cause the conveyance roller 21 B to be pressed with the contact pressing force selected at Step S 12 (Step S 14 ).
- the conveyance roller 21 B is pressed against the facing roller 22 B with the determined contact pressing force and the sheet P is conveyed by rotation of the conveyance roller 21 B, the sheet P moves toward the near side in the direction of sheet width.
- Step S 11 determines whether or not the sheet is at or near the center on the basis of the output of the sheet detection sensors 19 (Step S 15 ).
- Step S 15 If the sheet is at or near the center (Step S 15 ; YES), the controller 11 controls the roller selector 182 to release pressure contact of the conveyance rollers 21 A and 21 B (Step S 16 ).
- Step S 16 After performing Step S 16 or, if the sheet is not at or near the center at Step S 15 (Step S 15 ; NO), the controller 11 determines whether or not the sheet is drawn to the near side on the basis of the output of the sheet detection sensors 19 (Step S 17 ).
- Step S 17 If the sheet is drawn to the near side (Step S 17 ; YES), the controller 11 determines the deviation amount (extent of deviation to the near side) on the basis of the output of the sheet detection sensors 19 . Then, the controller 11 determines the contact pressing force on the basis of the deviation amount (Step S 18 ). Specifically, the controller 11 selects a larger contact pressing force for a larger deviation amount.
- the controller 11 controls the roller selector 182 to select the conveyance roller 21 A of incompressible rubber material (Step S 19 ).
- the controller 11 controls the contact pressure changer 183 and cause the conveyance roller 21 A to be pressed with the contact pressing force determined at Step S 18 (Step S 20 ).
- the conveyance roller 21 A is pressed against the facing roller 22 A with the determined contact pressing force and the sheet P is conveyed by rotation of the conveyance roller 21 A, the sheet P moves toward the far side in the direction of sheet width.
- Step S 20 After performing Step S 20 , or if the sheet is not drawn to the near side at Step S 17 (Step S 17 ; NO), the process is returned to Step S 11 and repeated.
- a gap in speed of the sheet P in the direction of sheet width can be generated according to its deviation (how much the sheet P is deviated in the direction of sheet width) as the contact pressing force of the conveyance roller 21 A or the conveyance roller 21 B to be used is changed on the basis of the deviation amount of the sheet P.
- the image forming apparatus in the third embodiment is configured similarly to the image forming apparatus 100 in the first embodiment except for the positions of the conveyance rollers 21 used for the sheet deviation control.
- the common components are labelled with the same reference signs, and descriptions thereof are omitted.
- the configuration and processing specific to the third embodiment are described.
- the conveyance rollers 21 A and 21 B which have speed characteristics different from each other are provided at a side end apart from the central part in the direction of sheet width.
- a conveyance roller 21 (first conveyance roller) to increase the speed of the sheet P is arranged on one side and another conveyance roller 21 (second conveyance roller) to decrease the speed of the sheet P is arranged on the other side across the central part in the direction of sheet width.
- FIG. 13 is a schematic top view of the conveyance rollers 21 C, 21 D, 21 E, and 21 F used for the sheet deviation control.
- the conveyance roller 21 C and the conveyance roller 21 D are arranged at positions farther than the center in the direction of sheet width on the sheet conveyance path.
- the conveyance roller 21 C is made of a material (an incompressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 C in contact therewith at a speed higher than the rotation speed of the conveyance roller 21 C.
- the conveyance roller 21 D is made a material (a compressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 D in contact therewith at a speed lower than the rotation speed of the conveyance roller 21 D.
- the conveyance roller 21 E and the conveyance roller 21 F are arranged at positions nearer than the center in the direction of sheet width on the sheet conveyance path.
- the conveyance roller 21 E is made of a material (an incompressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 E in contact therewith at a speed higher than the rotation speed of the conveyance roller 21 E.
- the conveyance roller 21 F is made of a material (a compressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 F in contact therewith at a speed lower than the rotation speed of the conveyance roller 21 F.
- the conveyance rollers 21 C, 21 D, 21 E, and 21 F respectively faces the facing rollers 22 C, 22 D, 22 E, and 22 F, though not shown in the drawings.
- the roller selector 182 selects at least one of the conveyance rollers 21 C, 21 D, 21 E, and 21 F as a roller(s) to convey the sheet P for the sheet deviation control.
- the roller selector 182 may cause the conveyance rollers 21 C, 21 D, 21 E, and 21 F to be pressed or separated individually.
- the controller 11 causes the roller selector 182 to select at least one of the conveyance rollers 21 C, 21 D, 21 E, and 21 F on the basis of the position of the sheet P detected by the sheet detection sensors 19 A and 19 B.
- FIG. 14 is a flow chart of the third sheet deviation control processing executed by the image forming apparatus in the third embodiment.
- the controller 11 determines whether or not the sheet is drawn to the far side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 21 ).
- Step S 21 the controller 11 controls the roller selector 182 to select the conveyance roller 21 D of compressible rubber material from the group of the conveyance rollers on the far side (conveyance rollers 21 C and 21 D) and the conveyance roller 21 E of incompressible rubber material from the group of the conveyance rollers on the near side (conveyance rollers 21 E and 21 F) (Step S 22 ).
- the sheet conveyance speed is higher on the near side than on the far side, and thus the sheet P moves toward the near side in the direction of sheet width.
- Step S 22 After performing Step S 22 , or if the sheet is not drawn to the far side at Step S 21 (Step S 21 ; NO), the controller 11 determines whether or not the sheet is at or near the center on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 23 ).
- Step S 24 the controller 11 controls the roller selector 182 to release pressure contact of the conveyance rollers 21 C, 21 D, 21 E, and 21 F (Step S 24 ).
- the controller 11 may cause them to be in a slightly pressed state which does not generate a gap in speed in the direction of sheet width.
- the controller 11 may control the roller selector 182 to select the conveyance rollers 21 C and 21 E of the same material (with the same speed characteristics) so as not to generate a gap in speed in the direction of sheet width.
- the controller 11 may control the roller selector 182 to select the conveyance rollers 21 D and 21 F of the same material (with the same speed characteristics) so as not to generate a gap in speed in the direction of sheet width.
- Step S 24 After performing Step S 24 , or if the sheet is not at or near the center at Step S 23 (Step S 23 ; NO), the controller 11 determines whether or not the sheet is drawn to the near side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 25 ).
- Step S 25 the controller 11 controls the roller selector 182 to select the conveyance roller 21 C of incompressible rubber material from the group of the conveyance rollers on the far side and the conveyance roller 21 F of compressible rubber material from the group of the conveyance rollers on the near side (Step S 26 ).
- the conveyance rollers 21 C and 21 F are pressed against the facing rollers 22 C and 22 F and the sheet P is conveyed by rotation of the conveyance rollers 21 C and 21 F, the sheet conveyance speed is higher on the far side than on the near side concerning the sheet P (continuous sheet), and thus the sheet P moves toward the far side in the direction of sheet width.
- Step S 26 After performing Step S 26 , or if the sheet is not drawn to the near side at Step S 25 (Step S 25 ; NO), the process is returned to Step S 21 and repeated.
- the group of the conveyance rollers including the conveyance roller 21 C of incompressible rubber material and the conveyance roller 21 D of compressible rubber material is arranged on one side and the group of the conveyance rollers including the conveyance roller 21 E of incompressible rubber material and the conveyance roller 21 F of compressible rubber material is arranged on the other side across the center in the direction of sheet width.
- the force is dispersedly applied to the sheet P in comparison to the first embodiment. Accordingly, the sheet deviation control can be efficiently executed and damages to the sheet P may be suppressed.
- the conveyance rollers 21 having speed characteristics different from each other are selected at the opposite ends in the direction of sheet width (the conveyance roller 21 C and the conveyance roller 21 F, or the conveyance roller 21 D and the conveyance roller 21 E).
- the conveyance rollers 21 of the same type may be selected on the far side and on the near side to be used as regular conveyance rollers which do not generate a gap in speed in the direction of sheet width, advantageously.
- either one of the conveyance rollers 21 on one side may be pressed. This can reduce the amount or the speed of movement in the direction of sheet width, compared to a case where the conveyance rollers 21 on the both sides are used.
- the third embodiment similarly to the second embodiment, it is possible to change how much the surface speed of the conveyance roller 21 at the nip part gets higher or lower by changing the contact pressing force of the conveyance rollers 21 .
- a gap between the original conveyance speed of the sheet and the surface speed of the conveyance roller 21 is smaller than in a case where a gap in speed of the sheet P in the direction of sheet width is generated by using a brake, etc.
- damages on the sheet P may be suppressed, advantageously.
- the image forming apparatus in the fourth embodiment is configured similarly to the image forming apparatus 100 in the first embodiment except for the positions of the conveyance rollers 21 used for the sheet deviation control.
- the common components are labelled with the same reference signs, and descriptions thereof are omitted.
- the configuration and processing specific to the fourth embodiment are described.
- a conveyance roller 21 (first conveyance roller) to increase the speed of the sheet P and another conveyance roller 21 (second conveyance roller) to decrease the speed of the sheet P are arranged on each of the opposite sides across the center in the direction of sheet width, and the conveyance rollers 21 with speed characteristics different from each other rotate on the same axis.
- FIG. 15 is a schematic top view of conveyance roller sets Q and R used for the sheet deviation control.
- the conveyance roller set Q is configured as a conveyance roller 21 G and a conveyance roller 21 H which rotate on the same axis.
- the conveyance roller 21 G is made of a material (compressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 G in contact therewith at a speed lower than the rotation speed of the conveyance roller 21 G.
- the conveyance roller 21 H is made of a material (incompressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 H in contact therewith at a speed higher than the rotation speed of the conveyance roller 21 H.
- the conveyance roller set R is configured as the conveyance roller 21 J and the conveyance roller 21 K which rotate on the same axis.
- the conveyance roller 21 J is made of a material (incompressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 J in contact therewith at a speed higher than the rotation speed of the conveyance roller 21 J.
- the conveyance roller 21 K is made of a material (compressible rubber material) which causes the sheet P to be conveyed by the conveyance roller 21 K in contact therewith at a speed lower than the rotation speed of the conveyance roller 21 K.
- the conveyance roller 21 G and the conveyance roller 21 J are arranged at positions farther than the center in the direction of sheet width on the sheet conveyance path.
- the conveyance roller 21 H and the conveyance roller 21 K are arranged at positions nearer than the center in the direction of sheet width on the sheet conveyance path.
- the conveyance roller 21 H which is arranged (on one side) at a position nearer than the center in the direction of sheet width and the conveyance roller 21 G which is arranged (on the other side) at a position farther than the center in the direction of sheet width are configured to rotate on the same axis.
- the conveyance roller 21 K which is arranged (on one side) at a position nearer than the center in the direction of sheet width and the conveyance roller 21 J which is arranged (on the other side) at a position farther than the center in the direction of sheet width are configured to rotate on the same axis.
- the conveyance rollers 21 G, 21 H, 21 J, and 21 K respectively faces the facing rollers 22 G, 22 H, 22 J, and 22 K, though not shown in the drawings.
- the roller selector 182 selects the conveyance roller set Q (the conveyance rollers 21 G and 21 H) or the conveyance roller set R (the conveyance rollers 21 J and 21 K) as the rollers to convey the sheet P for the sheet deviation control.
- the roller selector 182 may cause the conveyance roller sets Q and R to be pressed or separated individually.
- the controller 11 causes the roller selector 182 to select the conveyance roller set Q or the conveyance roller set Ron the basis of the position of the sheet P detected by the sheet detection sensors 19 A and 19 B.
- FIG. 16 is a flow chart of the fourth sheet deviation control processing executed by the image forming apparatus in the fourth embodiment.
- the controller 11 first determines whether or not the sheet is drawn to the far side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 31 ).
- Step S 31 If the sheet is drawn to the far side (Step S 31 ; YES), the controller 11 controls the roller selector to select the conveyance roller set Q (Step S 32 ). That is, the conveyance roller 21 G of compressible rubber material is pressed against the facing roller 22 G on the far side, and the conveyance roller 21 H of incompressible rubber material is pressed against the facing roller 22 H on the near side.
- the sheet conveyance speed is higher on the near side than on the far side, and thus the sheet P moves toward the near side in the direction of sheet width.
- Step S 32 After performing Step S 32 , or if the sheet is drawn to the far side at Step S 31 (Step S 31 ; NO), the controller 11 determines whether or not the sheet is at or near the center on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 33 ).
- Step S 33 If the sheet is at or near the center (Step S 33 ; YES), the controller 11 controls the roller selector 182 to release pressure contact of the conveyance roller sets Q and R (Step S 34 ).
- Step S 34 After performing Step S 34 or if the sheet is not at or near the center at Step S 33 (Step S 33 ; NO), the controller 11 determines whether or not the sheet is drawn to the near side on the basis of the output of the sheet detection sensors 19 A and 19 B (Step S 35 ).
- Step S 35 the controller 11 controls the roller selector 182 to select the conveyance roller set R (Step S 36 ). That is, the conveyance roller 21 J of incompressible rubber material is pressed against the facing roller 22 J on the far side, and the conveyance roller 21 J of compressible rubber material is pressed against the facing roller 22 K on the near side.
- the sheet conveyance speed is higher on the far side than on the near side concerning the sheet P (continuous sheet), and thus the sheet P moves toward the far side in the direction of sheet width.
- Step S 35 After performing Step S 36 , or if the sheet is not drawn to the near side at Step S 35 (Step S 35 ; NO), the process is returned to Step S 31 and repeated.
- FIG. 17 is a timing chart showing the sheet position, the output of the sheet detection sensors 19 A and 19 B, and the contact and release of the conveyance roller sets Q and R.
- the sheet position X shown in FIG. 17 is where the output of the sheet detection sensor 19 A is changed between ON and OFF, and the sheet position Y is where the output of the sheet detection sensor 19 B is changed between ON and OFF.
- the sheet conveyance speed is higher at a part where the conveyance roller 21 H conveys the sheet in contact therewith and lower at a part where the conveyance roller 21 G conveys the sheet in contact therewith, when an equal contact pressing force is applied to the both edges of the set Q of conveyance rollers which rotate on the same axis.
- the conveyance roller set Q does not necessarily have a gap in the contact pressing force between the opposite ends in the direction of sheet width, and the sheet deviation control may be realized by a simple mechanism. The same can be said about the conveyance roller set R.
- the conveyance roller set R has speed characteristics contrary to that of the conveyance roller set Q.
- the conveyance roller set Q or the conveyance roller set R may be selectively used depending on whether the sheet P is drawn to the far side or to the near side.
- the position of the sheet P in the width direction may not be changed while the conveyance roller sets Q and R may be slightly pressed to keep the conveyance driving force to some extent.
- the conveyance roller sets Q and R are switched between two states, contact and release.
- the contact pressing force may be selected from among three or more levels so that the sheet deviation control may be executed more accurately.
- the contact pressing force of the conveyance roller sets Q and R may be changed to control how much the surface speed of the conveyance rollers 21 at the nip part is higher or lower, similarly to the second embodiment.
- a continuous sheet is used as the sheet P, though the present invention is applicable to a case where a cut sheet is used.
- a gap in speed in the direction of sheet width results in movement of the sheet P in the opposite direction.
- FIG. 18A shows a case where the conveyance roller 21 A of incompressible rubber material as described in the first embodiment is selected for a cut sheet.
- the rotation driving force which gives a rotation speed Vp to the conveyance roller 21 A is applied while the sheet P is being conveyed at a sheet speed Vp
- the surface speed Vt1 of the conveyance roller 21 A is higher than the speed Vp.
- a force F 11 to rotate in the left direction acts on the sheet P because of the gap in speed (Vt1>Vp) in the direction of sheet width on the sheet P, and thus the sheet P moves toward the near side.
- FIG. 18B shows a case where the conveyance roller 21 B of compressible rubber material as described in the first embodiment is selected for a cut sheet.
- the rotation driving force which gives a rotation speed Vp to the conveyance roller 21 B is applied while the sheet P is being conveyed at a sheet speed Vp
- the surface speed Vt2 of the conveyance roller 21 B is lower than the speed Vp.
- a force F 12 to rotate in the right direction acts on the sheet P because of the gap in speed (Vt2 ⁇ Vp) in the direction of sheet width on the sheet P, and thus the sheet P moves toward the far side.
- the contact pressing force of the conveyance roller 21 may be adjusted by using the amount of shrinking of the conveyance roller 21 , since the contact pressing force of the conveyance roller 21 is more easily controllable at a lower cost than by direct measurement or control of the contact pressing force by the contact pressure changer 183 .
- h1 is a radius of the conveyance roller 21 pressed against the facing roller 22 as shown in FIG. 19A
- h2 is a distance between the center of the roller axis of the conveyance roller 21 and the sheet P as shown in FIG. 19B
- the contact pressing force of the conveyance roller 21 may be simply adjusted by adjustment of the amount h3 of shrinking.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Registering Or Overturning Sheets (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Controlling Sheets Or Webs (AREA)
Abstract
Description
Vt>Vs.
Vt<Vs.
Vt1>Vp.
Vt2<Vp.
Claims (8)
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JP2018194759A JP7110901B2 (en) | 2018-10-16 | 2018-10-16 | Paper conveying device and image forming device |
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US20200115177A1 US20200115177A1 (en) | 2020-04-16 |
US11345559B2 true US11345559B2 (en) | 2022-05-31 |
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US16/592,660 Active 2040-05-04 US11345559B2 (en) | 2018-10-16 | 2019-10-03 | Sheet conveyance device and image forming apparatus |
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US6463250B1 (en) | 2000-10-04 | 2002-10-08 | Nexpress Solutions Llc | Externally heated deformable fuser roller |
JP2003321147A (en) | 2002-05-01 | 2003-11-11 | Pfu Ltd | Correction mechanism for medium conveyance |
JP2007039172A (en) | 2005-08-01 | 2007-02-15 | Canon Machinery Inc | Method and device for correcting sheet meandering |
JP6520388B2 (en) | 2015-05-26 | 2019-05-29 | 株式会社ジェイテクト | Web transport device |
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2018
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US6059284A (en) * | 1997-01-21 | 2000-05-09 | Xerox Corporation | Process, lateral and skew sheet positioning apparatus and method |
JP2005330084A (en) | 2004-05-21 | 2005-12-02 | Ricoh Printing Systems Ltd | Image forming device |
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DE102010046754A1 (en) * | 2010-09-28 | 2012-03-29 | Rolf Hessenbruch | Device for eliminating wrinkling by application of lateral forces, has brush wheels which are provided with bristles on their whole circumference |
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JP2020063112A (en) | 2020-04-23 |
US20200115177A1 (en) | 2020-04-16 |
JP7110901B2 (en) | 2022-08-02 |
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